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A preparation method of ultrafine silver powder with uniform particle size and concentration
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An ultra-fine silver and uniform technology, which is applied in the field of preparation of ultra-fine silver powder, can solve the problem that there is no effective method and no better method for powder particle size, and achieve low cost, high uniformity and concentration, and wide source of raw materials Effect
Inactive Publication Date: 2016-03-02
宁波晶鑫电子材料有限公司
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Problems solved by technology
[0003] As for the powder prepared by chemical reduction method, the dispersibility of the powder is very important. The suitable reducing agent and dispersant have a great relationship with the molding and performance of the powder. In China, the selection of reaction system and dispersant are selected. A lot of research work has been carried out, but there is no effective method for how to improve the concentration of powder particle size and uniformity of shape in production. There are many studies on particle size and powder dispersion. How to improve There is no better method for the concentration of powder particle size. However, the concentration of powder particle size is of great help to the printing performance of conductive silver paste and the improvement of photovoltaic characteristics. Therefore, on the basis of ensuring the fineness of powder Increased powder concentration is critical
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Embodiment 1
[0028] (1) Dissolve 110g gum arabic and 110g potassium sulfate in 1780g water for later use as system A;
[0029] (2) Weigh 2200g Vc and dissolve it in 36L water and add it to system A, stir and disperse, add 600g nitric acid (analytical pure), then adjust the temperature to 30°C, as system B;
[0030] (3) Weigh 4000g of silver nitrate and dissolve it in 40L of water to adjust the temperature to 30°C as system C;
[0031] (4) Quickly pour system B into system C for reaction, control the pouring time within 5s, continue to react for 20 minutes after all B is poured in, clean it by centrifugation, wash it several times, dry it at 80 degrees for 10 hours, take it out and dry it The final powder can be crushed.
Embodiment 2
[0033] (1) Dissolve 120g gum arabic and 120g potassium sulfate in 1760g water for later use as system A;
[0034] (2) Weigh 2200g of Vc and dissolve it in 36L of water, add it to system A, add 650g of nitric acid (analytical pure) after stirring and dispersing, and then adjust the temperature to 30°C, as system B;
[0035] (3) Weigh 4000g of silver nitrate and dissolve it in 36L of water to adjust the temperature to 30°C as system C;
[0036] (4) Quickly pour system B into system C for reaction, control the pouring time within 5s, continue to react for 30 minutes after all B is poured in, clean it by centrifugation, wash it several times, dry it at 80 degrees for 15 hours, take it out and dry it The final powder can be crushed.
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Abstract
The invention relates to a method for preparing superfine sliver powder uniform and concentrated in particle size. The method includes: (1) dissolving Arabic gum and potassium sulfate in water to obtain a system A; (2) adding water solution containing vitamin C into the system A, adding nitric acid after stirring and dispersing, and adjusting temperature to 30+ / -2 DEC G to obtain a system B; (3) dissolving silver nitrate in water and adjusting temperature to 30+ / -2 DEC G to obtain a system C; (4) pouring the system B into the system C quickly, allowing for standing for continuous reaction, mixing up while adding water for several times after reaction is over, performing centrifugal separation, taking out for centrifugalization, drying solid and grinding to obtain the superfine sliver powder. The method is simple to operate, wide in range of raw material sources and low in cost and has low requirements on equipment. The obtained superfine sliver powder is uniform and concentrated in particle size and consistent in shape.
Description
technical field [0001] The invention belongs to the field of preparation of ultrafine silver powder, in particular to a preparation method of ultrafine silver powder with uniform and concentrated particle size. Background technique [0002] Photovoltaic power generation, also known as solar cells, is the most beautiful, longest-lived, most reliable, and most environmentally friendly power generation technology. Solar cells are also the earliest means for human beings to develop and utilize solar energy. One of them is conductive silver paste, which is favored by many domestic and foreign manufacturers for its advantages of good conductivity, good heat sensitivity, and good photosensitivity. The selection of raw materials used in the slurry is very important. The prepared slurry is required to have good screen printing properties, high-efficiency photovoltaic properties, and good mechanical properties. The selection of environmentally friendly materials is also critical. The...
Claims
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Application Information
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